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Old 07-20-2013, 04:38 AM   #1
Articwhite2008
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2008 Astra XR
Default Manual transmission fluid change

I have 75k miles on my car, all highway miles. I think its time to change my fluids. Where is the drain plug. Where do i fill the fuilds and where is the dipstick to check. Also what are some recommended oils.
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Old 07-20-2013, 04:28 PM   #2
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2008 Astra XR
Default Re: Manual transmission fluid change

Drain procedure here:
http://www.astraownersclub.com/docum...cal/boxoil.pdf
No drain plugs, no dip stick.

Part numbers for the gaskets are uk gm, maybe diffrent in the states.

For oil discussion do an advanced search for "gear oil" in the Astra section.
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Old 07-24-2013, 10:43 PM   #3
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Default Re: Manual transmission fluid change

Dang that looks more complicated than doing it on the auto.
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Old 07-25-2013, 12:59 AM   #4
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Default Re: Manual transmission fluid change

Yea more bolts and scraping. Also can be a bit more messy when the fluid comes out, best to have a super large pan to catch it all. Getting dirty is half the fun! LOL

Checked, the gasket number is the same in US: 90345227

You in LA? Glad to give assistance if needed.
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Old 07-31-2013, 03:49 AM   #5
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Default Re: Manual transmission fluid change

Moved to NorCal. Thanks for the part number. I think I need to do this, my shifting is not as smooth as i remembered and I am at 75k
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Old 08-16-2015, 10:22 PM   #6
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Default Re: Manual transmission fluid change

Hey all,

Just wondering if anyone out there has an active link to a procedure to flushing the tranmission fluid on a manual car? The link above doesn't work and i cant seem to find this information readily available. Is it because it's a manual so not too people actually change the tranny fluid?

Thanks for the help!
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Old 08-17-2015, 03:14 AM   #7
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Default Re: Manual transmission fluid change

Ah that sucks that was a good guide.

Well looking in the service manual I cannot find a procedure for drain and fill. All I could find was a document that explains how to check the level and condition of the fluid. But we can deduce some of the important stuff from page 2 at the bottom.





So basically to drain remove the bottom covers multiple bolts and let the fluid all drain out.

Remove cover, clean up the cover and the mating surface of the trans with a plastic (not metal) scraper to get all the old gasket material off there.

Install a new gasket (GM Part 90345227) with the cover. Cannot find torque specs on those bolts. Pretty snug would be my guess.

Remove reverse switch and inspection bolt.

Fill with new fluid (GM Part 88862472) through the reverse switch hole (how you get fluid in is anyone guess? Fluid pump? or bottle with hose on it and squeeze it in) until it dribbles out the inspection hole.

Reinstall inspection hole bolt and reverse switch (may need a new seal for that, cannot find part number, maybe just a standard o-ring??)

Done.

From what I read the inspection bolt is kind of hard to get to.

Wish I could tell you more.
Good Luck!
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Old 08-17-2015, 03:25 AM   #8
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Default Re: Manual transmission fluid change

Some More Specs:

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Old 08-17-2015, 03:39 AM   #9
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Default Re: Manual transmission fluid change

I was able to recover the text of the original document thanks to google:

Tools required:
• 11mm socket and ratchet, 13mm ring spanner, 19mm open ended spanner.
• Torque wrench.
• Loctite thread lock or similar.
• Container to catch oil.
• Stanley knife or similar (optional)
• New sump plate gasket, No.90345227 on F17, No.90523143 on F18
• Hylomar gasket paste or similar (optional)
• Gearbox oil 1.6L in F17 All photos show F17 gearbox, F18 is very similar so shouldn't cause a problem following this How-To.

Step 1 To get the best results it's preferable to have the gearbox oil warm, take the car for a short run, 5-6 miles to get it nice and warm. I used ramps but axle stands can be used if preferred. Ramp up car or place on axle stands, allow at least 10 mins for the exhaust to cool down as it will be red hot and could give you a very nasty burn.

Step 2 This is the sump plate you need to remove to drain the gearbox oil. The F17 has 10 bolts holding it on, the F18 has 11 so it's easy to check which you have. The F17 is used on the 1.8 engines,both X18XE1 and Z18XE. The F18 was used on early 2.0 Astras. It's most important that you check the gasket you have is correct BEFORE you remove the sump plate, hold it against the plate to check it's correct.

Step 3 Using the 11mm socket and ratchet, undo the bolts holding the sump plate: work in a cross wise fashion to relieve the pressure evenly. Have a suitable container under the gearbox to catch the old oil. The bolts have been fitted using thread lock, they will be hard to undo initially. However, if when you are undoing them, they tighten up do not force them - you will strip the thread out of the gearbox if you aren't careful. Best method is to re-tighten the bolt as this tends to cut the thread lock off the threads, the bolt should then come out easier, repeat the process if need be until the bolt feels looser.

Step 4 Leave at least one of the bolts in place but loose. Tap the sump plate with a rubber hammer or piece of wood, when it starts to give off a hollow sound the plate is due to come off. Allow all the oil to drain and remove the sump plate, check inside the bottom of the sump plate for any undue residue,small pieces of metal etc. There should be very little on the plate if the box is in decent nick. Anything other than this and consider having the box checked. Clean the sump plate .

Step 5 You can see in the photos (below) that small pieces of the old gasket remain, it's vital you remove them from both the plate and the box; I use a sharp Stanley knife edge on for this.

Step 6 After cleaning the sump plate and box surfaces apply some non setting gasket paste like Hylomar (I think our US equivilent would be RTV gasket maker silicone) , this is optional but I prefer this method in case any of the surfaces are not totally flat. Fit the gasket and refit the plate back onto the box, putting thread lock on the bolts. Tighten the bolts in a cross wise method and tighten up to the required torque, see below. Looks like this, nice and clean

Step 7 Lower the car. Park the car on level ground. Remove the reverse light switch, shown in photo(below), and also the gearbox oil level plug, also pictured but on my spare box for clarity. Reverselight switch is 19mm and level plug is 13mm but you need a proper ring spanner due to its location. Make sure you clean the area around the reverse light switch before removing it, I used some carb cleaner which did the job a treat.

Step 8 Fill the gearbox through the reverse light switch - the F17 takes approx 1.6L. When the oil starts to drip through the level plug stop filling and wait for it to stop dripping. Refit and connect the reverse light switch and refit and tighten the level plug. Take the car for a drive and check for leaks, and then wait a couple of days and recheck the level again by removing the level plug.

Torque Wrench settings
Never over tighten bolts in alloy components – you may strip the thread or crack the component

Lower cover bolts:
F18 gear box – 40Nm /30lbf ft
F17 (alloy plate) – 12Nm /12lbf ft
F17 (steel plate) – 30Nm /22lbf ft
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Old 08-17-2015, 07:42 PM   #10
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Default Re: Manual transmission fluid change

Wow! Thanks for digging all that out, really appreciate it. Loads of good information. It doesn't look too complicated, but there was no mention of a fluid pump in the last procedure...it looks like I may still need one.

My car has never had a tranny fluid since I owned it. It's at a 110km now; I think I will go for it and let you know how it goes!
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Old 08-17-2015, 10:43 PM   #11
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Default Re: Manual transmission fluid change

Quote:
Originally Posted by sabukwiek View Post
Wow! Thanks for digging all that out, really appreciate it. Loads of good information. It doesn't look too complicated, but there was no mention of a fluid pump in the last procedure...it looks like I may still need one.
Yea what I noticed was that he said take it off the jacks and then do the fill which says to me the fill hole and inspection hole can be seen from the top? I just assumed it was done from the bottom so you would need a pump. Think you still might need a tube to get the fluid in there since the hole is on the side of the case (it seems) But maybe just a funnel with a tube attached?

Definitely let us know what you come up with!
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Old 08-20-2015, 08:54 PM   #12
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Default Re: Manual transmission fluid change

We don't need to change transmission oil unless we need to do some work in the transmission e.g. clutch replacement. A lots of good experienced drivers say with good treatment "manual trannies" never need service. It will be illogical car manufacturers will miss a drain plug, and put 10 bolts to change oil. Page 9-12 of our Owner Manual says to inspect the transmission for fluid leaks… aleluya
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Old 04-25-2016, 08:03 PM   #13
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Wrench Re: Manual transmission fluid change

I know it's been a while since this thread has been touched, and I'm sure it's been asked already, but, do you have to use the ACDelco fluid or will standard GL4 gear oil in the same weight range work?

Reason being for the question,
trans-plant.

Ha!

...but seriously, not a laughing matter...lol
...
'92 SL2 - 108,000 miles (traded)
'96 SL2 - 312,000 miles (blew up)
'98 SL2 - ??????? miles (parts car)
'99 SL2 - 168,000 miles (Sold 11/08)
'08 Astra - 131,000 miles and counting!
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Old 01-06-2019, 02:56 PM   #14
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Default Re: Manual transmission fluid change

Just thought I'd revive this thread to share my experience. I replaced my original factory fill with Redline MT-85 today at 105,000 miles. I have always experienced harder effort to get into gear on a cold morning and an overall clunky shifter feel since new. So far it feels better, the shifter goes into each gear a little easier, but I'll update later after more miles.

The big thing I found was I didn't have to drop the pan and replace the gasket because I have one of those fluid transfer pumps, just like this:



To do this method, you only need to worry about the two plugs as mentioned earlier in this thread:
  • "Fill Plug" which is also an electrical sensor. 7/8" deep socket.
  • "Level plug" which is just above the pan, near the driver side axle. 13mm wrench.

Both can be reached from below if you just jack the car up. I did not even remove a wheel. First I removed both the Fill Plug and Level Plug, with 7/8" deep socket and a 13mm box wrench respectively. Nothing comes out.

Then I stuck the smallest hose attachment I had for my fluid pump into the Level Plug hole, as deep as I could finagle it, and pumped. I had to keep re-positioning the hose to make sure I was sucking up fluid, until I couldn't get any more. I was able to get 1 entire quart out this way, though I got a little messy.

Then I attached a small hose to a funnel and shoved the hose into the Fill Plug hole, with the Level Plug hole still open. I had the funnel rigged up in the engine bay so I could just add fluid and let it go. It flows very slowly due to the high viscosity, so this part took a while. I kept adding new fluid until it started dripping out of the Level Plug hole.

Once fluid runs out of the Level Plug hole, just re-install the two plugs, connect the sensor to the harness, and you're good to go.
...
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Old 01-14-2019, 11:37 AM   #15
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Default Re: Manual transmission fluid change

Thanks for providing that, MB. Looks a lot easier.

How much time would you estimate this takes?
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Old 01-15-2019, 09:56 AM   #16
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Default Re: Manual transmission fluid change

Maybe an hour or so. The longest part was waiting for the new fluid to funnel down into the trans. It's highly viscous so it flows very slowly, especially through the small hose.

After about 200 miles, the only noticeable difference is on cold mornings it goes into gear much more easily. I used to struggle by putting it in 2nd, then 1st, but now it goes into 1st directly from neutral. Maybe it shifts better in general, but not sure if that's just confirmation bias, like when people claim to notice a difference after changing engine oil. Regardless, I'm glad I did it because the fluid that came out looked pretty awful.
...
'08 Astra XE 5-speed
'72 Chevrolet El Camino
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Old 08-02-2020, 04:35 PM   #17
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Default Re: Manual transmission fluid change

I thought to add to this thread instead of opening up a new one.

In regards to the oil. Part 88862472 oil from GM seems to be discontinued, or has it been replaced by ACDelco? This is what I'm getting on ebay:

https://www.ebay.com/itm/Manual-Tran...4/274126108004

Does anybody know if this stuff is good? Is it the same quality as OEM? I keep looking for the original GM bottles, but nothing.
...
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Old 08-03-2020, 03:24 AM   #18
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Default Re: Manual transmission fluid change

Yup thats the stuff, replaced by a new part number 19351859. Look for a better price on that one.
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Old 08-03-2020, 03:49 AM   #19
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Default Re: Manual transmission fluid change

Yup that's the stuff, replaced by a new part number 19351859. Look for a better price on that one.
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Old 08-03-2020, 03:15 PM   #20
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Default Re: Manual transmission fluid change

Quote:
Originally Posted by smwalker View Post
Yup that's the stuff, replaced by a new part number 19351859. Look for a better price on that one.
Thanks!
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